Keith wrote:
Once you check out the site I mentioned earlier (print it out) start at
the GPS wiring, where it's signal is being sent to whatever...
computer, VHS, SSB, etc. That's most likely where the problem is.

As I replied earlier, the problem is radiated noise from the Danfoss
BD50 compressor control module. I have turn every electrical item on the
boat on and off individually to determine which, if any, generate noise,
either via the DC wiring or radiated. None cause a problem except the
compressor module. Glenn Ashmore provided the part numbers of shielded
control modules. I believe that when I finally find a place to purchase
one, my problem will be solved.
krj